Good power design?

Discussion in 'The Projects Forum' started by skybox, Aug 13, 2009.

  1. skybox

    Thread Starter Active Member

    Mar 2, 2009
    Hi guys,

    I am working on my first electronics design and am looking for some tips. I have about 12V coming in from a battery and most of my circuit uses 3.3Vdc. The regulator converts the voltage to a 3.3Vdc out with 1.5A max output and is designed according to the spec sheet.

    I have attached an image of my basic design. Any suggestions or tips would be greatly appreciated.
  2. mik3

    Senior Member

    Feb 4, 2008
    what is the purpose of the coils?
  3. skybox

    Thread Starter Active Member

    Mar 2, 2009

    They are common mode chokes to reduce EMI
  4. jj_alukkas

    Distinguished Member

    Jan 8, 2009
    A 100uF on Vout is enough. You can flip the other 100uF to Vin though the datasheet wont specify them. Its acts good for heavy load regulation.

    A simple choke is no better than a good cap. If chokes need to work good, they must be used in conjuction to capacitors, I dont remember how, read it sometims back on wiki abt rectifiers.